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首页> 外文期刊>Geochemistry, geophysics, geosystems >Geochemical behavior of dissolved manganese in the East China Sea: Seasonal variation, estuarine removal, and regeneration under suboxic conditions
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Geochemical behavior of dissolved manganese in the East China Sea: Seasonal variation, estuarine removal, and regeneration under suboxic conditions

机译：东海溶解锰的地球化学行为：季节性变化，河口去除和在低氧条件下的再生

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摘要

To better understand the geochemical cycle of dissolved manganese (Mn) in the East China Sea (ECS), the distribution of dissolved Mn across the ECS was investigated during three field studies in 2011 (May, August, and November). The concentration of dissolved Mn decreased across the ECS with distance from the coast. Mn-rich ECS shelf waters could export to the Kuroshio Waters, and had the potential to influence the northwest Pacific Ocean as well as the Japan Sea. The Kuroshio Waters were devoid of dissolved Mn, so its incursion could be tracked as it entered the ECS continental shelf region (approximately 50 m isobath). Seasonal variations of dissolved Mn in the ECS were significant, with the highest concentrations occurring in summer. Dissolved Mn in the Changjiang Estuary was nonconservative, and significant quantities were removed by net sorption onto suspended particulate matter. A model describing the sorption processes was applied to data for the Changjiang Estuary. Regeneration of dissolved Mn took place in near-bottom waters of the suboxic zone in August 2011, following extensive consumption of oxygen. The benthic flux of dissolved Mn was estimated based on Mn concentrations in the overlying waters and the near-bottom waters. A preliminary box model was established to develop a dissolved Mn budget for the ECS. Based on the dissolved Mn content in the ECS and the total input flux, a residence time of 76-350 days for dissolved Mn in the ECS was inferred.
机译：为了更好地了解东海（ECS）中溶解锰（Mn）的地球化学循环，在2011年（5月，8月和11月）的三个野外研究中调查了整个ECS中溶解锰的分布。随着距海岸的距离，整个ECS中溶解的Mn浓度降低。富锰的ECS架子水可以出口到黑潮水域，并有可能影响西北太平洋和日本海。黑潮水域不含溶解的锰，因此可以在其进入ECS大陆架区域（等深线约50 m）时追踪其入侵。 ECS中溶解锰的季节变化非常明显，夏季最高。长江口中溶解的Mn是非保守的，并且通过净吸附到悬浮颗粒物上去除了大量。将描述吸附过程的模型应用于长江口的数据。在大量消耗氧气之后，2011年8月，在低氧区近底部的水中发生了溶解锰的再生。根据上覆水域和近底部水域中的Mn浓度估算溶解的Mn底栖通量。建立了初步的盒子模型来为ECS制定溶解的锰预算。根据ECS中溶解的Mn含量和总输入通量，推断ECS中溶解的Mn的停留时间为76-350天。

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